Because the WiiU is overpriced HW wise and the PS4 and X1, while very capable, are not super advanced themselves. That said the PS4 and X1 are priced correctly and the WiiU is not.
To sumarize, PS4 is adequetly priced for what it is and is can be profitable at a decent price. The X1, while less powerful than the PS4, is desperately trying to keep some kind of competitive edge and cuts price ft or that reason alone. And the WiiU, while only being slightly above last gen, is just trying to make up for lack of overall sales.
Keep in mind that while a price cut will help move units, it will never sell in droves at this point. I think Ninty is just trying to get as much short term profit as possible before NX to be honest.
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